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• P+ Por[al pond and fill pond Designs IE\ 1~-? and E\ ]~-12) <br />\- a) Can the inlet ditch to P: till pond 006 be rotund to znter thz pond at thz south~~est <br />\ ~tl, 'N ~ znd^ Currently. thz pond inlet zntzrs in uiz middlz of this nan~o~s pond. rendering <br />lN' e 1 %? of thz pond as dead stora_z. [f the inlet cannot be rzlocatzd. pleasz renm dzsign <br />calculations using ~0°,o dzad storaee. <br />h) The pond volume for this pond is depictzd on EXIT-1-1 as li9 nc-fr. Is this corrzct" <br />5~1\ ~~ Fill 9 pond designs (Ex 1~-11) <br />a) The Division notes that the effluent sediment concentration predicted be the <br />SEDCAD- model is relativeh close to the maximum allowed effluent sediment <br />~ concentration. This does not appear to be attributable to a high percentaee of cla} <br />siied particles in the disturbed watershed. Although the Division kill acczpt this <br />desitin information. it ma.' be .vise to verily the desitin information and evaluate <br />possible changes to brin_ the predicted effluent sediment concentration do~~n. <br />Response <br />P1P2 Portal <br />• ~ a. Figure Ex. ld-1 has been modified [o show D8, to specify ditch directions a[ the <br />P1P'_ portal and to clear up some uncertainties associated with the southern clean <br />water ditches (C~VDS-1 and 2). This has been cross-checked with Table 1~-1. and <br />chanties made accordineh . <br />b. The lowest elevation of the orifice for the P1P2 pond (No. 011) has been modified <br />on Figure Ex. 1~-1-1 to 6851.x'. <br />c. The elevation-discharge and elevation-area-capacity-dischartie curves for the P1P? <br />pond runs are attached. <br />d. The hydrograph detention time can not be increased as the run assumes a constant <br />maximum mine water discharge of 3 cfs. <br />e. There is a permanent pool due to the constant mine water discharge from the mine <br />and the constant dischartie from the riser. <br />f'. Culvert 180+9~ is shown on both itfap ?.05.3-3 and on Figure Ex. 16-1. as are the <br />other three cuherts associated with this portal (160+40. 165+73, and 172~d9). <br />• ~_ LCC respectively requests tha[ the Division reconsider the request fur 100-year <br />ditches around [he temporary overburden stockpiles. The regulations require such <br />protection for permanent excess spoil bank or coal mine waste fills. tills <br />13 <br />